摘要
为了获得PC仪器系统中高稳定度的测试信号源,设计了一块以AD9850为核心的模拟输出卡。在介绍模拟输出卡组成原理的基础上,研究了ADSP2181对AD9850的控制问题,并介绍了直接数字频率合成技术的基本工作原理,详细介绍了模拟输出卡的监控程序。经过实验,输出信号纯净,几乎不含噪声。
To achieve a kind of signal source with highly stability, the design of analog output module based on AD9850 DDS chip is introduced. The principal of the module is described,and the method that the ADSP-2181 controls the AD9850 is researched. Also, the direct digital synthesis theory is introduced. The interface technology of IDMA used to communicate with computer and the program used to monitor and control DSP are specified. The experiment result shows that the output signal is of pure frequency and high SNR.
出处
《计算机测量与控制》
CSCD
2004年第9期863-865,876,共4页
Computer Measurement &Control
基金
国防科技大学博士基金资助项目(20020305)
